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我猜C, 因為他看的到B的顏色, 所以跟B一樣的顏色為只有1/3.
thanks for sharing
i think  is d
過了五分鐘也不知道,現在的小學生題見真難。
thanks for sharing
C, because D didn't say anything.
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A... because he can see in the reflection from B's pupil of the colour of his hat.
C 因為D不知道 表示前面是一黑一
猜不出來,
% ]  m# _, G& a/ V, J+ r; T1 sd可能知道。
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D吧 如果係跟次序的話
不知道
不知道
It should be C.  If C's hat is white, then D should know D's is black.  However, D could not answer right away, then it mean D saw a white and a black in front of D.  C can conclude that his hat is black.
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